FIX: Assertion Failure when you change the type of a column in SQL Server 2014

Symptoms

Assume that you have a table that has a clustered columnstore index in Microsoft SQL Server 2014. You run a DDL query against the table to change the data type of an existing column. For example, you update the data type for Column_1 of Table_1 from VARCHAR (499) to NVARCHAR (500) by running the following command:

ALTER TABLE Table_1 ALTER COLUMN Column_1 NVARCHAR(500) NOT NULL

In this situation, multiple assertion failures occur, and you receive the following error message:

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